/*
 * jQuery Easing v1.4.1 - http://gsgd.co.uk/sandbox/jquery/easing/
 * Open source under the BSD License.
 * Copyright © 2008 George McGinley Smith
 * All rights reserved.
 * https://raw.github.com/gdsmith/jquery.easing/master/LICENSE
 */

(function(factory) {
	if (typeof define === "function" && define.amd) {
		define(['jquery'], function($) {
			return factory($);
		});
	} else if (typeof module === "object" && typeof module.exports === "object") {
		exports = factory(require('jquery'));
	} else {
		factory(jQuery);
	}
})(function($) {

	// Preserve the original jQuery "swing" easing as "jswing"
	if (typeof $.easing !== 'undefined') {
		$.easing['jswing'] = $.easing['swing'];
	}

	var pow = Math.pow,
		sqrt = Math.sqrt,
		sin = Math.sin,
		cos = Math.cos,
		PI = Math.PI,
		c1 = 1.70158,
		c2 = c1 * 1.525,
		c3 = c1 + 1,
		c4 = (2 * PI) / 3,
		c5 = (2 * PI) / 4.5;

	// x is the fraction of animation progress, in the range 0..1
	function bounceOut(x) {
		var n1 = 7.5625,
			d1 = 2.75;
		if (x < 1 / d1) {
			return n1 * x * x;
		} else if (x < 2 / d1) {
			return n1 * (x -= (1.5 / d1)) * x + .75;
		} else if (x < 2.5 / d1) {
			return n1 * (x -= (2.25 / d1)) * x + .9375;
		} else {
			return n1 * (x -= (2.625 / d1)) * x + .984375;
		}
	}

	$.extend($.easing, {
		def: 'easeOutQuad',
		swing: function(x) {
			return $.easing[$.easing.def](x);
		},
		easeInQuad: function(x) {
			return x * x;
		},
		easeOutQuad: function(x) {
			return 1 - (1 - x) * (1 - x);
		},
		easeInOutQuad: function(x) {
			return x < 0.5 ?
				2 * x * x :
				1 - pow(-2 * x + 2, 2) / 2;
		},
		easeInCubic: function(x) {
			return x * x * x;
		},
		easeOutCubic: function(x) {
			return 1 - pow(1 - x, 3);
		},
		easeInOutCubic: function(x) {
			return x < 0.5 ?
				4 * x * x * x :
				1 - pow(-2 * x + 2, 3) / 2;
		},
		easeInQuart: function(x) {
			return x * x * x * x;
		},
		easeOutQuart: function(x) {
			return 1 - pow(1 - x, 4);
		},
		easeInOutQuart: function(x) {
			return x < 0.5 ?
				8 * x * x * x * x :
				1 - pow(-2 * x + 2, 4) / 2;
		},
		easeInQuint: function(x) {
			return x * x * x * x * x;
		},
		easeOutQuint: function(x) {
			return 1 - pow(1 - x, 5);
		},
		easeInOutQuint: function(x) {
			return x < 0.5 ?
				16 * x * x * x * x * x :
				1 - pow(-2 * x + 2, 5) / 2;
		},
		easeInSine: function(x) {
			return 1 - cos(x * PI / 2);
		},
		easeOutSine: function(x) {
			return sin(x * PI / 2);
		},
		easeInOutSine: function(x) {
			return -(cos(PI * x) - 1) / 2;
		},
		easeInExpo: function(x) {
			return x === 0 ? 0 : pow(2, 10 * x - 10);
		},
		easeOutExpo: function(x) {
			return x === 1 ? 1 : 1 - pow(2, -10 * x);
		},
		easeInOutExpo: function(x) {
			return x === 0 ? 0 : x === 1 ? 1 : x < 0.5 ?
				pow(2, 20 * x - 10) / 2 :
				(2 - pow(2, -20 * x + 10)) / 2;
		},
		easeInCirc: function(x) {
			return 1 - sqrt(1 - pow(x, 2));
		},
		easeOutCirc: function(x) {
			return sqrt(1 - pow(x - 1, 2));
		},
		easeInOutCirc: function(x) {
			return x < 0.5 ?
				(1 - sqrt(1 - pow(2 * x, 2))) / 2 :
				(sqrt(1 - pow(-2 * x + 2, 2)) + 1) / 2;
		},
		easeInElastic: function(x) {
			return x === 0 ? 0 : x === 1 ? 1 :
				-pow(2, 10 * x - 10) * sin((x * 10 - 10.75) * c4);
		},
		easeOutElastic: function(x) {
			return x === 0 ? 0 : x === 1 ? 1 :
				pow(2, -10 * x) * sin((x * 10 - 0.75) * c4) + 1;
		},
		easeInOutElastic: function(x) {
			return x === 0 ? 0 : x === 1 ? 1 : x < 0.5 ?
				-(pow(2, 20 * x - 10) * sin((20 * x - 11.125) * c5)) / 2 :
				pow(2, -20 * x + 10) * sin((20 * x - 11.125) * c5) / 2 + 1;
		},
		easeInBack: function(x) {
			return c3 * x * x * x - c1 * x * x;
		},
		easeOutBack: function(x) {
			return 1 + c3 * pow(x - 1, 3) + c1 * pow(x - 1, 2);
		},
		easeInOutBack: function(x) {
			return x < 0.5 ?
				(pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2 :
				(pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2;
		},
		easeInBounce: function(x) {
			return 1 - bounceOut(1 - x);
		},
		easeOutBounce: bounceOut,
		easeInOutBounce: function(x) {
			return x < 0.5 ?
				(1 - bounceOut(1 - 2 * x)) / 2 :
				(1 + bounceOut(2 * x - 1)) / 2;
		}
	});

});
